logic gates and logic circuits

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Logic Gates Presenation.

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Introduction to Logic Gates AND Gate It is an electronic circuit, which generates an output signal of 1 if and only if all input signals are also 1 An AND gate is the physical realization of the logical multiplication ( AND operation ) A B Input i 0 / 1 0 1 Suppose Input is 1 OUTPUT Suppose Input is 0

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B A Block Diagram of AND Gate Output 1 . 1 = 1 d A B i 0 / 1 OUTPUT INPUT OUTPUT 1 1 1 1 0 0 0 1 0 0 0 0 1

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B A Block Diagram of AND Gate Output 1 . 0 = 0 0 A B i 0 / 1 OUTPUT INPUT OUTPUT 1 1 1 1 0 0 0 1 0 0 0 0

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B A Block Diagram of AND Gate Output 0 . 1 = 0 0 A B i 0 / 1 OUTPUT INPUT OUTPUT 1 1 1 1 0 0 0 1 0 0 0 0

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B A Block Diagram of AND Gate Output 0 . 0 = 0 0 A B i 0 / 1 OUTPUT INPUT OUTPUT 1 1 1 1 0 0 0 1 0 0 0 0

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1 A i B OUTPUT OR Gate It is an electronic circuit, which generates an output signal of 1, if any of the output signals is 1 It is the physical realization of logical OR 0 / 1 1 1

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Block Diagram of OR Gate gg A i B OUTPUT 0 / 1 A B 1 + 1 = 1 INPUT OUTPUT 1 1 1 1 0 1 0 1 1 0 0 0 1

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Block Diagram of OR Gate gg A i B OUTPUT 0 / 1 A B 1 + 0 = 1 INPUT OUTPUT 1 1 1 1 0 1 0 1 1 0 0 0 1

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Block Diagram of OR Gate gg A i B OUTPUT 0 / 1 A B 0 + 1 = 1 INPUT OUTPUT 1 1 1 1 0 1 0 1 1 0 0 0 1

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Block Diagram of OR Gate gg A i B OUTPUT 0 / 1 A B 0 + 0 = 0 INPUT OUTPUT 1 1 1 1 0 1 0 1 1 0 0 0 1

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NOT Gate It is an electronic circuit- that generates an output signal, which is reverse of input signal It is the physical realization of complementation operation Not Gate is also called inverter because it inverts the input. Output 1 0 A INPUT OUTPUT 0 1 1 0

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NOT Gate 0 1 A INPUT OUTPUT 0 1 1 0 Ā

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NAND Gate N ot AND Gate - NOT + AND gate It is a combination of NOT and AND gates It is Complemented AND Gate A B A.B Output INPUT OUTPUT 1 1 0 1 0 1 0 1 1 0 0 1 Symbol of NAND gate Truth Table + = = A ↑ B Equation of NAND Gate

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NAND Gate N ot AND Gate - NOT + AND gate It is a combination of NOT and AND gates It is Complemented AND Gate A B A.B Output INPUT OUTPUT 1 1 0 1 0 1 0 1 1 0 0 1 Symbol of NAND gate Truth Table + = = A ↑ B Equation of NAND Gate

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NAND Gate N ot AND Gate - NOT + AND gate It is a combination of NOT and AND gates It is Complemented AND Gate A B A.B Output INPUT OUTPUT 1 1 0 1 0 1 0 1 1 0 0 1 Symbol of NAND gate Truth Table + = = A ↑ B Equation of NAND Gate

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NAND Gate N ot AND Gate - NOT + AND gate It is a combination of NOT and AND gates It is Complemented AND Gate A B A.B Output INPUT OUTPUT 1 1 0 1 0 1 0 1 1 0 0 1 Symbol of NAND gate Truth Table + = = A ↑ B Equation of NAND Gate

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NOR Gate NOT – OR Gate NOT Gate + OR Gate It is complement OR gate Symbol of NOR Gate A B INPUT OUTPUT 1 1 0 1 0 0 0 1 0 0 0 1 Truth Table . = = A ↑ B Equation of NOR Gate A B A + B 1 + 1 = 0 Output Output

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NOR Gate NOT – OR Gate NOT Gate + OR Gate It is complement OR gate Symbol of NOR Gate A B INPUT OUTPUT 1 1 0 1 0 0 0 1 0 0 0 1 Truth Table . = = A ↑ B Equation of NOR Gate A B A + B 1 + 0 = 0 Output Output

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NOR Gate NOT – OR Gate NOT Gate + OR Gate It is complement OR gate Symbol of NOR Gate A B INPUT OUTPUT 1 1 0 1 0 0 0 1 0 0 0 1 Truth Table . = = A ↑ B Equation of NOR Gate A B A + B 0 + 1 = 0 Output Output

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NOR Gate NOT – OR Gate NOT Gate + OR Gate It is complement OR gate Symbol of NOR Gate A B INPUT OUTPUT 1 1 0 1 0 0 0 1 0 0 0 1 Truth Table . = = A ↑ B Equation of NOR Gate A B A + B 0 + 0 = 1 Output Output 